Textbook Question
Carbohydrates are acted on by:
a. Peptidases, trypsin, and chymotrypsin
b. Amylase, maltase, and sucrase
c. Lipases
d. Peptidases, lipases, and galactase
Ch. 23 The Digestive System
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System10
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton11
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity28
- Ch. 14 The Autonomic Nervous System18
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart22
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses29
- Ch. 22 The Respiratory System20
- Ch. 23 The Digestive System30
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System25
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System23
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook
Chapter 22, Problem 3
The lamina propria forms part of the:
a. Muscularis externa
b. Submucosa
c. Serosa
d. Mucosa
Verified step by step guidance1
Step 1: Understand the layers of the gastrointestinal (GI) tract wall. The main layers from inside to outside are: mucosa, submucosa, muscularis externa, and serosa (or adventitia).
Step 2: Recall that the mucosa itself is composed of three sublayers: the epithelium (innermost lining), the lamina propria (a layer of connective tissue), and the muscularis mucosae (a thin layer of smooth muscle).
Step 3: Identify the lamina propria as the connective tissue layer that supports the epithelium and contains blood vessels, lymphatics, and immune cells.
Step 4: Recognize that the lamina propria is part of the mucosa layer, not the submucosa, muscularis externa, or serosa.
Step 5: Conclude that the correct answer is the mucosa, since the lamina propria forms part of this innermost layer of the GI tract.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Lamina Propria
The lamina propria is a thin layer of loose connective tissue found beneath the epithelium of mucous membranes. It contains blood vessels, nerves, and immune cells, providing support and nourishment to the epithelium. It plays a key role in immune defense and tissue repair.
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Characteristic 2: Tightly Pressed Tissue Anchored to Basement Membrane
Mucosa Layer
The mucosa is the innermost layer of the gastrointestinal tract, consisting of the epithelium, lamina propria, and muscularis mucosae. It functions in absorption, secretion, and protection, forming the interface between the lumen and underlying tissues.
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Layers of the Gastrointestinal Tract
The GI tract wall is organized into four main layers: mucosa, submucosa, muscularis externa, and serosa. Each layer has distinct structures and functions, with the lamina propria specifically located within the mucosa layer.
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Related Practice
Textbook Question
The peritoneal cavity:
a. Is the same thing as the abdominopelvic cavity
b. Is filled with air
c. Like the pleural and pericardial cavities is a potential space containing serous fluid
d. Contains the pancreas and all of the duodenum
Textbook Question
Obstruction of the hepatopancreatic sphincter impairs digestion by reducing the availability of:
a. Bile and HCl
b. HCl and intestinal juice
c. Pancreatic juice and intestinal juice
d. Pancreatic juice and bile
Textbook Question
The parasympathetic nervous system influences digestion by:
a. Relaxing smooth muscle
b. Stimulating peristalsis and secretory activity
c. Constricting sphincters
d. None of these
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Textbook Question
The digestive juice product containing enzymes capable of digesting all four major foodstuff categories is:
a. Pancreatic
b. Gastric
c. Salivary
d. Biliary
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